| 2000 |
TCL/RhoJ is a new Rho GTPase sharing 85% similarity to TC10 and 78% to Cdc42, showing rapid GDP/GTP exchange with higher GTP dissociation and hydrolysis rates than TC10. In vitro, GTP-bound (but not GDP-bound) TCL directly interacts with Cdc42/Rac interacting binding (CRIB) domains found in PAK and WASP, as demonstrated by yeast two-hybrid and GST pull-down assays. Constitutively active TCL produces large F-actin-rich dorsal ruffles in REF-52 fibroblasts, and this morphogenic activity is blocked by dominant negative Rac1 and Cdc42, indicating cross-talk among these three GTPases. |
Yeast two-hybrid, GST pull-down, in vitro GDP/GTP exchange assay, overexpression in REF-52 fibroblasts |
The Journal of Biological Chemistry |
High |
10967094
|
| 2003 |
TCL/RhoJ localizes to the plasma membrane and early/sorting endosomes in HeLa cells. siRNA knockdown of TCL causes transferrin (internalized via clathrin) to accumulate in Rab5-positive uncoated vesicles and fail to reach EEA1-positive early endosomes or pericentriolar recycling endosomes, slowing transferrin release. Constitutively active TCL causes internalized transferrin to accumulate in EEA1-positive early/sorting endosomes and recycle directly from there. Replacing the C-terminus of active Cdc42 or TC10 with that of TCL phenocopies active TCL, indicating the C-terminus determines endosomal specificity. Thus TCL is essential for clathrin-dependent cargo entry into early/sorting endosomes. |
siRNA knockdown, dominant-active/dominant-negative constructs, immunofluorescence, transferrin trafficking assay, C-terminal chimeras |
Molecular Biology of the Cell |
High |
12960428
|
| 2003 |
TCL/RhoJ (TC10betaL) expression is rapidly induced early in adipocyte differentiation of 3T3-L1 cells. Antisense TCL inhibits adipocyte differentiation, while sense TCL in NIH-3T3 cells promotes oil droplet accumulation and adipogenic marker gene expression in a PPARγ-dependent manner, placing TCL upstream of PPARγ in adipogenesis. |
Antisense inhibition, sense overexpression in NIH-3T3 cells, Oil Red O staining, adipogenic marker gene expression |
The Journal of Biological Chemistry |
Medium |
12578843
|
| 2010 |
RhoJ/TCL is expressed in endothelial cells in vivo and localizes to focal adhesions by immunofluorescence. VEGF activates RhoJ in endothelial cells. siRNA knockdown of RhoJ increases focal adhesions, stress fibers, actomyosin contractility (elevated phospho-MLC), and impairs endothelial migration and tubule formation; constitutively active RhoJ (daRhoJ) has the converse effect. Pharmacological inhibition of ROCK or non-muscle myosin II reverses the migration/tube-formation defects caused by RhoJ knockdown, placing RhoJ upstream of actomyosin contractility. |
siRNA knockdown, constitutively active mutant overexpression, immunofluorescence (focal adhesion localization), VEGF activation assay, collagen gel contraction, ROCK/myosin II inhibitors |
Arteriosclerosis, Thrombosis, and Vascular Biology |
High |
21148427
|
| 2011 |
RhoJ is transcriptionally regulated by the ETS factor ERG in endothelial cells; ERG knockdown reduces RhoJ expression by 75%, and ERG binds functional sites in the proximal RhoJ promoter (by ChIP and transactivation assays). RhoJ knockdown blocks EC lumen formation in 3D collagen matrices and is associated with increased RhoA activation and decreased Rac1/Cdc42 activation, placing RhoJ downstream of ERG and upstream of Rho GTPase balance in lumenogenesis. |
siRNA knockdown of ERG, qPCR, ChIP, transactivation reporter assay, 3D lumen formation assay, Rho GTPase activation assays |
Blood |
High |
21628409
|
| 2012 |
RhoJ activates PAK1 in response to drug-induced DNA damage in melanoma cells. Active PAK1 uncouples ATR from its downstream effectors, blunting the DNA damage response (DDR). ATR suppression leads to decreased ATF2 phosphorylation and increased Sox10 expression. This RhoJ→PAK1 axis was identified through a genome-wide RNAi screen and validated by functional studies, establishing RhoJ as a regulator of melanoma chemoresistance via the DDR. |
Genome-wide RNAi screen, targeted siRNA knockdown, western blot for ATR/DDR signaling, PAK1 activity assays |
Cancer Research |
Medium |
22971344
|
| 2012 |
Arhgef15, an endothelial-specific RhoGEF, mediates VEGF-induced Cdc42 activation and also potentiates RhoJ inactivation in endothelial cells to promote actin polymerization, cell motility, and retinal vascular growth. Loss of Arhgef15 in mice delays retinal vascular network extension. |
In vitro GEF activity assay (Cdc42/RhoJ activation), Arhgef15 knockout mouse retinal angiogenesis assay |
PloS One |
Medium |
23029280
|
| 2013 |
RhoJ depletion inhibits melanoma cell migration and invasion in vitro and reduces tumor growth and lymphatic spread in vivo. Mechanistically, RhoJ induces phosphorylation of LIMK, cofilin, and p41-ARC (an ARP2/3 complex subunit) in a PAK1-dependent manner, both in vitro and in tumor xenografts, thereby modulating actin cytoskeletal dynamics. |
siRNA knockdown, overexpression, western blot for LIMK/cofilin/ARP2/3 phosphorylation, Transwell migration/invasion assays, xenograft mouse models |
Pigment Cell & Melanoma Research |
Medium |
23253891
|
| 2014 |
Active RhoJ (daRhoJ) co-precipitates with the GIT-PIX complex. An interaction between daRhoJ and GIT1 was confirmed by yeast two-hybrid and depends on the Spa homology domain of GIT1. GIT1, GIT2, β-PIX, and RhoJ all co-localize in focal adhesions and depend on each other for focal adhesion recruitment. RhoJ regulates focal adhesion disassembly time (siRNA increases it; daRhoJ decreases it). Knockdown of GIT1+GIT2 or β-PIX phenocopies RhoJ knockdown in tube formation. RhoJ-knockout mice show reduced tumor growth and tumor vessel density. |
Co-immunoprecipitation, yeast two-hybrid, timelapse microscopy of focal adhesion disassembly, siRNA knockdown, RhoJ-knockout mouse tumor model |
Journal of Cell Science |
High |
24928894
|
| 2014 |
RhoJ blockade in tumor endothelial cells inhibits tumor angiogenesis and disrupts preformed tumor vessels through activation of the RhoA-ROCK signaling pathway. RhoJ blockade combined with chemotherapy, anti-angiogenic, or vascular-disrupting agents shows enhanced anticancer effects. |
RhoJ siRNA/dominant-negative in tumor endothelial cells, RhoA-ROCK activity assay, in vivo tumor models |
Cancer Cell |
Medium |
24434213
|
| 2016 |
The N-terminal 18-amino-acid extension of TCL/RhoJ (not present in Cdc42) regulates plasma membrane localization and nucleotide exchange. A truncation lacking the N-terminus (ΔN) alters both membrane association and nucleotide binding. Chimera experiments mapped additional contribution to nucleotide loading to amino acids 121-129 of TCL (a loop region distal to the nucleotide binding pocket), identifying an allosteric mechanism for nucleotide exchange regulation. |
Truncation mutants, point mutants, TC10/TCL chimeras, GTPase biochemical assays (nucleotide exchange), membrane fractionation |
The Journal of Biological Chemistry |
High |
27660391
|
| 2017 |
RhoJ deletion in BRAF-mutant melanocytes modulates expression of the pro-apoptotic protein BAD and genes involved in cellular metabolism, impairing nevus formation, cellular transformation, and metastasis. PAK inhibitors that block RhoJ signaling halt BRAF-mutant melanoma tumor growth in vivo and induce apoptosis in melanoma cells in vitro via a BAD-dependent mechanism, identifying a RhoJ→PAK→BAD signaling axis. |
RhoJ deletion in BRAF-mutant melanocytes, PAK inhibitor treatment, apoptosis assays, in vivo tumor models, transcriptomic/metabolic profiling |
PLoS Genetics |
Medium |
28753606
|
| 2018 |
RhoJ promotes hypoxia-induced endothelial-to-mesenchymal transition (EndMT) by upregulating WDR5, a component of the H3K4 methyltransferase complex. RhoJ depletion blocks TWIST and SNAIL induction, blocks their promoter recruitment by HIF-1α, and reduces H3K4 trimethylation at their gene promoters. Lentiviral overexpression of WDR5 rescues TWIST/SNAIL expression and EndMT in RhoJ-depleted cells under hypoxia. |
siRNA knockdown, ChIP assay (HIF-1α binding, H3K4me3), lentiviral WDR5 overexpression, EndMT marker analysis |
Journal of Cellular Biochemistry |
Medium |
29130522
|
| 2020 |
RhoJ regulates endosomal trafficking of α5β1 integrin in endothelial cells to repress fibronectin fibrillogenesis. Vesicle purification and proteomic analysis identified α5β1 integrin as a major RhoJ cargo. RhoJ acts in opposition to Cdc42 in this process through competition for a shared effector, PAK3. Mice lacking RhoJ show deregulated fibronectin deposition around vessels during developmental angiogenesis. |
Vesicle purification, mass spectrometry proteomics, PAK3 competition assay, RhoJ-knockout mouse developmental angiogenesis analysis |
Current Biology |
High |
32302585
|
| 2020 |
In the GTP-bound state, RhoJ directly interacts with the cytoplasmic domain of PlexinD1. Upon Sema3E stimulation, RhoJ is released from PlexinD1, inducing cell contraction. PlexinD1-bound RhoJ facilitates Sema3E-induced PlexinD1-VEGFR2 association, VEGFR2 transphosphorylation at Y1214, and p38 MAPK activation, driving reverse EC migration. Upon VEGF stimulation, RhoJ is required for formation of the holoreceptor complex (VEGFR2/PlexinD1/neuropilin-1), preventing VEGFR2 degradation and prolonging PLCγ/Erk/Akt signaling for forward EC migration. After GTP hydrolysis, RhoJ shifts from PlexinD1 to VEGFR2, terminating VEGFR2 signals. |
Co-immunoprecipitation (RhoJ-PlexinD1), VEGFR2 phosphorylation assay, holoreceptor complex formation assay, p38/PLCγ/Erk/Akt signaling analysis, RhoJ-deficient EC migration assays |
The EMBO Journal |
High |
32347571
|
| 2020 |
ETV2 directly binds the promoter region of Rhoj and acts as an upstream transcriptional regulator of Rhoj in endothelial progenitors during embryogenesis. ETV2 overexpression robustly increases Rhoj expression; Etv2 knockout abolishes Rhoj expression. shRNA-mediated knockdown of Rhoj causes migration defects that are partially rescued by ETV2 overexpression, establishing an ETV2→Rhoj cascade for endothelial progenitor migration. |
ChIP-seq (ETV2 binding to Rhoj promoter), ATAC-seq, shRNA knockdown, ETV2 overexpression, Etv2 knockout embryoid bodies, single-cell RNA-seq co-expression analysis |
Arteriosclerosis, Thrombosis, and Vascular Biology |
High |
33115267
|
| 2020 |
A membrane-anchored ITSN1 (Intersectin 1) DH-PH construct directly activates RhoJ, promoting endothelial cell sprouting. This was demonstrated by co-immunoprecipitation of the catalytic ITSN1 DH-PH module with RhoJ, and is sensitive to FAK-mediated phosphorylation and to dominant-negative RhoJ. This ITSN1/RhoJ axis is independent of Cdc42. |
Gain-of-function with constitutively active RhoGEFs, co-immunoprecipitation (ITSN1 DH-PH with RhoJ), dominant-negative RhoJ, FAK inhibition, endothelial sprouting assay |
Biochemical and Biophysical Research Communications |
Medium |
31980169
|
| 2020 |
MRTF-A binds the proximal TCL/RhoJ promoter in response to hypoxia in HT-29 colorectal cancer cells and activates TCL transcription. MRTF-A recruits the H4K16 acetyltransferase hMOF to the TCL promoter, enhancing H4K16 acetylation. MRTF-A or hMOF depletion attenuates hypoxia-induced TCL expression and cancer cell migration/invasion. TCL is required for the pro-migratory effect of MRTF-A. |
ChIP assay (MRTF-A and hMOF binding to TCL promoter, H4K16 acetylation), siRNA knockdown, Transwell migration/invasion assay |
Oncogenesis |
Medium |
32999272
|
| 2020 |
MKL1 (megakaryocytic leukemia 1) interacts with ERG1 and is recruited to the RhoJ promoter to activate RhoJ transcription in response to TGF-β in breast cancer cells. RhoJ depletion attenuates breast cancer cell migration, invasion in vitro and metastasis in vivo. |
Co-immunoprecipitation (MKL1-ERG1), ChIP assay (MKL1 recruitment to RhoJ promoter), siRNA knockdown, Transwell migration/invasion, in vivo metastasis model |
Frontiers in Cell and Developmental Biology |
Medium |
32984327
|
| 2021 |
KDM7A (JHDM1D), an H3K9/H3K27 dual demethylase, is essential for TGF-β-induced RHOJ transcription in breast cancer cells. MKL1 interacts with and recruits KDM7A to the RHOJ promoter to cooperatively remove repressive H3K9/H3K27 methylation. A SMAD2/SMAD4 complex binds the KDM7A promoter and mediates TGF-β-induced KDM7A transcription, establishing a TGF-β→SMAD2/SMAD4→KDM7A→MKL1→RHOJ epigenetic cascade. |
Co-immunoprecipitation (MKL1-KDM7A), ChIP (KDM7A recruitment, H3K9/H3K27 methylation status), siRNA knockdown, luciferase reporter, in vivo xenograft |
Frontiers in Cell and Developmental Biology |
Medium |
34249916
|
| 2023 |
RHOJ controls EMT-associated resistance to chemotherapy. RHOJ is preferentially expressed in EMT cancer cells and enhances the response to replicative stress by activating the DNA-damage response, enabling rapid repair of chemotherapy-induced DNA lesions. RHOJ interacts with proteins that regulate nuclear actin; inhibition of actin polymerization sensitizes EMT tumor cells to chemotherapy in a RHOJ-dependent manner. |
Gain/loss-of-function in vitro and in vivo (mouse SCC model), genome-wide transcriptomic and proteomic profiling, co-immunoprecipitation (RHOJ with nuclear actin regulators), actin polymerization inhibitor treatment |
Nature |
High |
36949199
|
| 2023 |
RHOJ aggravates gastric cancer invasion and metastasis by inducing EMT through IL-6/STAT3 signaling. RNA-seq and functional studies showed RHOJ activates the IL-6/STAT3 pathway; blocking IL-6/STAT3 signaling overcomes RHOJ-mediated cancer cell growth and migration. |
RNA-seq, Western blot, siRNA knockdown, Transwell invasion assay, xenograft models, IL-6/STAT3 pathway inhibitor rescue |
International Journal of Biological Sciences |
Medium |
37781036
|
| 2023 |
Oncogenic Gαq (Q209L mutant) enables the PDZ-RhoGEF (ARHGEF11) DH-PH catalytic module to interact with and activate RhoJ. Gαq Q209L was shown to drive PDZ-RhoGEF to interact with nucleotide-free RhoJ-G33A (a GEF-trap mutant). Gαq binding maps to the PH domain of PDZ-RhoGEF. PDZ-RhoGEF DH-PH expression caused endothelial cell contraction and sprouting inhibited by dominant-negative RhoJ, suggesting an allosteric mechanism by which mutant Gαq activates RhoJ via PDZ-RhoGEF. |
Co-immunoprecipitation (Gαq Q209L with PDZ-RhoGEF and RhoJ-G33A), GEF-trap assay, dominant-negative RhoJ rescue, endothelial cell contraction/sprouting assay |
International Journal of Molecular Sciences |
Medium |
37958718
|
| 2020 |
Rhoj interacts with moesin in glioblastoma cells to promote GBM cell proliferation and migration by potentiating Rac1/PAK pathway activation and cytoskeletal dynamics. Transcription factor c-Jun regulates Rhoj expression in GBM. |
Co-immunoprecipitation (Rhoj-moesin), siRNA knockdown, Rac1/PAK activation assay, western blot, in vivo GBM xenograft |
Neurotherapeutics |
Medium |
32822001
|
| 2022 |
RhoJ facilitates GBM angiogenesis through the JNK/VEGFR2-PAK-ERK signaling pathway. VEGF upregulates RhoJ expression; JNK inhibitor SP600125 reduces RhoJ expression. RhoJ silencing inhibits PAK-BRAF-ERK activity in endothelial cells, suggesting VEGF→JNK/VEGFR2→RhoJ→PAK→ERK circuitry. |
RNA-seq, Western blot, JNK inhibitor treatment, siRNA knockdown, HUVEC migration/tube formation assay, in vivo GBM model |
International Journal of Biological Sciences |
Low |
35173528
|
| 2021 |
RhoJ knockdown in A549 NSCLC cells accelerates TGF-β-mediated EMT and enhances invasion. Reduced RhoJ expression increases Smad3 phosphorylation and Snail expression during EMT, suggesting RhoJ normally suppresses TGF-β-Smad3 signaling. |
siRNA knockdown, western blot for p-Smad3 and Snail, Transwell invasion assay, TGF-β stimulation |
Biochemical and Biophysical Research Communications |
Low |
34119829
|
| 2025 |
RHOJ promotes melanoma cell adhesion and proliferation while inhibiting apoptosis through activation of the Rap1 signaling pathway. Knockdown of RHOJ reduces RAP1, RAP1GAP, and RasGRP3 levels; Rap1 pathway activation rescues the proliferation, adhesion, and anti-apoptotic effects lost upon RHOJ knockdown. |
siRNA knockdown, Rap1 pathway activator rescue, CCK-8, EdU, flow cytometry, adhesion assay, western blot |
Translational Cancer Research |
Low |
40950707
|
| 2025 |
RhoJ promotes ccRCC progression through the TNF-α/NF-κB axis; blocking this axis partially rescues the malignant phenotypes (proliferation, migration, invasion, EMT, and apoptosis resistance) induced by RhoJ overexpression. |
RNA-seq, siRNA knockdown, western blot, in vitro migration/invasion assays, orthotopic tumor model, TNF-α/NF-κB inhibitor rescue |
Translational Andrology and Urology |
Low |
40800090
|